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This page is a translated version of the page Proto:Undertale and the translation is 49% complete.
Other languages:
English • ‎中文(中国大陆)‎ • ‎한국어
Other languages:
English • ‎中文(中国大陆)‎ • ‎한국어

This page details one or more prototype versions of Undertale.

To do:
  • Demo 内还有更多不同以及未使用项。详看此处
  • 2013.05.23的Demo版本。最新版本发布于2013.06.08。


It's cool that you like my game this much.

Yes, I know these are easy to decompile... You can edit Yume Nikki and OFF in RPG Maker as well. This isn't really any different.
(对,我知道这些东西都很容易被反编译... 你可以试试在 RPG Maker 里修改梦日记或 OFF,都一样。)

My only wish is that you don't spoil the game for anyone else.
Wait for everyone to discover the secrets in here by themselves.
Otherwise, there will be no replay value :(


I'd also appreciate it if you held off on significant modifications before the full game is released.
I'll most likely be updating some things about the game that might make it interesting to play with.

I'll be watching...

Ha ha ha.

反编译者能看到的 Toby Fox 留下来的文字。存在于一个叫“Attention, Hackerz”的脚本。

Demo 不同


Demo Final
Undertale (Demo)-Intro.png Undertale (Final)-Intro.png

Loox 被修改成一个 Boss 怪物. 这个图片同时在最终版本也使用过, 如果 Flowey 搞得游戏崩溃后控制整个游戏.


Demo Final
Undertale (Demo)-Beginning Area.png Undertale (Final)-Beginning Area.png


Demo Final
Undertale (Demo)-Beginning Area2.png Undertale (Final)-Beginning Area2.png



Demo Final
What a cretin,
torturing such a
poor, innocent
What a terrible
creature, torturing
such a poor,
innocent youth...

当玩家第一次遇到Toriel时能看到这个文字,在那里她说Flowey骚扰玩家。 最终版本将“cretin”改为“terrible creature”。 这几乎肯定会改变,因为演示版本的线条根本不符合Toriel这种角色。



He doesn't have the option "Dinner" which is the option used to be able to spare him in the final, which means that you can only run from him or fight him. They can be spared, but only by reducing their HP first. Might have been from a possible limitation at the time, as you have to collect green carrots to allow him to be happy with you, but that would mean that Toby would've had to code in new functions to make it work like in the final.

In the demo, the "Eat" act will kill weakened Vegetoids, earning EXP and advancing the kill counter. The final replaces this with "Devour", which only eats them a little bit, ending the battle (technically) peacefully.



One of the most important functions of the game never appears in the demo, which is that a monster's name turns yellow when they can be spared in the final. This means that it is impossible to tell if a monster can be spared or not in the demo.

In the demo, it's possible to earn EXP by sparing injured monsters. This feature doesn't exist in the final game: given the nature of EXP in the game, the demo's behavior wouldn't make sense and could unfairly lock an unsuspecting player out of the best ending.

In the demo, Flowey and Chara have the ability to change the game's instruction manual based on the course of events the player takes. This was removed from the final version due to software limitations, although the graphics used for it are still in the final.

Unused Music

Grandpa Semi

  • A variant of the intro to Mettaton's battle theme with the odd filename "grandpasemi.ogg". In 1.001 of the final game, this is used, renamed to snd_grandpatemi. It plays when Temmie is denied Temmie Flakes.
grandpasemi Mettaton Battle (First few seconds)

Start Menu 1

As the player progresses through the game, the main menu music gets progressively more complex. In the demo, music tracks are overlaid on top of each other instead of being all in one file. They are slightly different from the final version.

The first track has slightly softer drumming.

Demo menu1 Final menu1

NOTE: "menu1.ogg" was renamed to "mus_menu0.ogg" in the final, and each subsequent song was decreased by 1 as a result, but for ease of reading each song will be referred to here by their demo name. There are only 4 menu variations in the demo, but 7 variations in the final.

Start Menu 2

In the demo, "Start Menu 2" is the bass accompaniment to "Start Menu 1". In the final, the bass and "Start Menu 1" are merged together.

Demo menu2 Final menu2

Start Menu 3

In the demo, "Start Menu 3" is a NES-sounding instrument. In the final, it's "Start Menu 2" with a piano playing the "Start Menu 1" layered on it.

Demo menu3 Final menu3

Start Menu 4

In the demo, "Start Menu 4" is made completely of orchestral instruments, with no NES-esque instruments. In the final, "Start Menu 4" is "Start Menu 3" with yet another NES instrument layered on.

Demo menu4 Final menu4

The demo's "Start Menu 4" sounds very similar to the final's "Start Menu 6".

Demo menu4 Final menu7